Lenovo ThinkServer RD220 3797 Series Installation And User Manual page 39

The following illustration shows the LEDs on the rear of the server:
1
Ethernet activity LED
2
Ethernet link LED
3
AC power LED (green)
4
DC power LED (green)
Ethernet activity LEDs: When these LEDs are lit, they indicate that the server is
transmitting to or receiving signals from the Ethernet LAN that is connected to the
Ethernet port.
Ethernet link LEDs: When these LEDs are lit, they indicate that there is an active
link connection on the 10BASE-T, 100BASE-TX, or 1000BASE-TX interface for the
Ethernet port.
AC power LED: Each hot-swap power supply has an ac power LED and a dc
power LED. When the ac power LED is lit, it indicates that sufficient power is
coming into the power supply through the power cord. During typical operation, both
the ac and dc power LEDs are lit. For any other combination of LEDs, see the
Hardware Maintenance Manual.
DC power LED: Each hot-swap power supply has a dc power LED and an ac
power LED. When the dc power LED is lit, it indicates that the power supply is
supplying adequate DC power to the system. During typical operation, both the ac
and dc power LEDs are lit. For any other combination of LEDs, see the Hardware
Maintenance Manual.
Power-supply error LED: When the power-supply error LED is lit, it indicates that
the power supply has failed.
System-error LED: When this LED is lit, it indicates that a system error has
occurred. An LED on the diagnostics panel is also lit to help isolate the error.
Power-on LED: Press this button to turn the server on and off manually or to wake
the server from a reduced-power state. The states of the power-on LED are as
follows:
Off: AC power is not present, or the power supply or the LED itself has failed.
Flashing rapidly (4 times per second): The server is turned off and is not
ready to be turned on. The power-control button is disabled. Approximately 3
minutes after the server is connected to ac power, the power-control button
becomes active.
Flashing slowly (once per second): The server is turned off and is ready to be
turned on. You can press the power-control button to turn on the server.
Lit: The server is turned on.
5
Power-supply error LED (amber)
6
System-error LED (amber)
7
Locator LED (blue)
8
Power-on LED (green)
Chapter 4. Server controls, LEDs, and power
23